Entanglement Growth from Entangled States: A Unified Perspective on Entanglement Generation and Transport

• URL: http://arxiv.org/abs/2510.08344v1
• Date: Thu, 09 Oct 2025 15:29:19 GMT
• Title: Entanglement Growth from Entangled States: A Unified Perspective on Entanglement Generation and Transport
• Abstract summary: We introduce a conceptual framework that decomposes entanglement growth into two mechanisms: build'' and move''<n>We find that MBL dynamics are move-dominated'', which naturally explains the observed non-monotonicity of the entanglement growth.
• Score: 4.588127679007806
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Studies of entanglement dynamics in quantum many-body systems have focused largely on initial product states. Here, we investigate the far richer dynamics from initial entangled states, uncovering universal patterns across diverse systems ranging from many-body localization (MBL) to random quantum circuits. Our central finding is that the growth of entanglement entropy can exhibit a non-monotonic dependence on the initial entanglement in many non-ergodic systems, peaking for moderately entangled initial states. To understand this phenomenon, we introduce a conceptual framework that decomposes entanglement growth into two mechanisms: ``build'' and ``move''. The ``build'' mechanism creates new entanglement, while the ``move'' mechanism redistributes pre-existing entanglement throughout the system. We model a pure ``move'' dynamics with a random SWAP circuit, showing it uniformly distributes entanglement across all bipartitions. We find that MBL dynamics are ``move-dominated'', which naturally explains the observed non-monotonicity of the entanglement growth. This ``build-move'' framework offers a unified perspective for classifying diverse physical dynamics, deepening our understanding of entanglement propagation and information processing in quantum many-body systems.

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